21211013320 has 64 divisors (see below), whose sum is σ = 54558864000. Its totient is φ = 7270179840.

The previous prime is 21211013309. The next prime is 21211013381. The reversal of 21211013320 is 2331011212.

It is a super-2 number, since 2×21211013320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211013294 and 21211013303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1138480 + ... + 1156960.

It is an arithmetic number, because the mean of its divisors is an integer number (852482250).

Almost surely, 2^21211013320 is an apocalyptic number.

21211013320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211013320 is an abundant number, since it is smaller than the sum of its proper divisors (33347850680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211013320 is a wasteful number, since it uses less digits than its factorization.

21211013320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22598 (or 22594 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21211013320 its reverse (2331011212), we get a palindrome (23542024532).

The spelling of 21211013320 in words is "twenty-one billion, two hundred eleven million, thirteen thousand, three hundred twenty".